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Borrowings - Schedule of Other Secured Borrowings (Footnote) (Details) - USD ($)			9 Months Ended
		Mar. 31, 2017	Sep. 30, 2018	Sep. 28, 2018	Sep. 27, 2018	May 31, 2018	Dec. 05, 2016
Debt Instrument [Line Items]
Available borrowing capacity			$ 52,800,000
Amended Senior Secured Term Loan [Member]
Debt Instrument [Line Items]
Face amount							$ 100,000,000
Percentage of equity interest in foreign subsidiaries pledged as security to secured debt			35.00%
Periodic prepayment of SSTL		$ 4,200,000
Maximum borrowing capacity							$ 335,000,000
Repurchase Agreements [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 100,000,000	$ 175,000,000	$ 137,500,000
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	[1]		2.60%
Secured Debt [Member] | Participation Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 250,000,000
Beneficial interest			100.00%
Secured Debt [Member] | Mortgage Warehouse Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 100,000,000
Beneficial interest			100.00%
Secured Debt [Member] | Master Repurchase Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 150,000,000.0
Beneficial interest			100.00%
Secured Debt [Member] | Master Repurchase Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 50,000,000.0
Secured Debt [Member] | Senior Secured Term Loan Option One [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Secured Debt [Member] | Senior Secured Term Loan Option One [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			4.00%
Secured Debt [Member] | Senior Secured Term Loan Option One [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.00%
Secured Debt [Member] | Senior Secured Term Loan Option Two [Member] | Eurodollar [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			5.00%
Secured Debt [Member] | Senior Secured Term Loan Option Two [Member] | Eurodollar Floor [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Mortgage Loan Warehouse Facility [Member]
Debt Instrument [Line Items]
Available borrowing capacity			$ 100,000,000
April 30, 2019 Maturity [Member] | Secured Debt [Member] | Participation Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 175,000,000.0
May 31, 2019 Maturity [Member] | Secured Debt [Member] | Participation Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 75,000,000.0
[1] Represents amounts due to the holders of beneficial interests in Ginnie Mae guaranteed HMBS. The beneficial interests have no maturity dates, and the borrowings mature as the related loans are repaid.

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